Malicious PDF — malware analysis report

Static analysis result for SHA-256 72217b237966bfb7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 09:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: edbe3f0d6b7ae91748a1a72ce48a98af SHA-1: 3378ac8073ee688c00b24863d43578d9feb255b4 SHA-256: 72217b237966bfb757c2daa0b50813b3ef8dfdb9e411cdf074178c49172d4749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=should+you+weigh+in+the+morning+or+at+night PDF link annotation
    • http://tythb.cn/uploadfile/files/33226529072.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/55prbs1ak4dmqptmgo581l2lr5/mafilawu.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/siloguxisokemusepofavipug.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/79908460709.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088f8c34c6cc---kidoneraselime.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/54821091417.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • http://datcat.vn/2018/file/sovepukafawakuxijop.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tp3818f23hn527e5d53unsm28s/18820121154.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608529cd95a32---49674230497.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///9986526010.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/04729f8c8ce16ef4c7124b02defc1a3f/71934008641.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/safifuka.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8ff0ae59---48235414277.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/zinudenaratinasedolosax.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/jifabi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865ea1e7c49---sulivaragutebefuruniz.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/13881371757.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/vifagavuvajijekono.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/88402122804.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608382ecb8484---pituriritimogatapikulage.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/likatonefopanobafizixugo.pdfIn PDF document text
    • http://iwort.de/userfiles/file/61175634604.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/16273767313.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 18192 bytes
SHA-256: 89f936cd01b0ea0a9c1d7df8050fa046ccb60e3701477df84785bd27c6b69c28
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10904 bytes
SHA-256: 15dfeb5b08a5a520a68429c74af8591f4ab5b79e86bd66e08677b8bb1362eaa4
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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